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@nit-rh 'taire @anni @frn Lenti-8 Patent No. 77,868, dated May 12, 1868.

IMPROVED SHOE FOB. AMALGAMATORS.

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'ro ALL WHOM I-'r MAY CONCERN:

Be it known that I, .I0-HN H. BULLOCK, of Gold Hill, county of Storey, State of Nevada, have invented an Improved Shoe for Grinding and Amalgamating Ores containing the precious metals;` and I do hereby declare the following description and accompanying drawings are suiiicient to enable any'persouskilled in the art or science to which it most nearly appertains to make and u'seiny said invention or improvements without further invention or experiment. n l

The nature oi' my invention consists in so construct-ing the shoes of grinders and amalgamators that the quicksilver whichis used in the process, and which, from its density or specific gravity, would naturally be thrown to the periphery ot' the pan as it revolves, is caught on the toe or point of thc shoes and carried to the'cente, and back againzthrongh grooves made at different angles in the face of the shoes.

To more fully illustrate and describe my invention, reference is had to the accompanying drawings, and letters marked thereon, of' whichl i Figure 1 is a top view of' the pan.

Figure 2'is a bottom view of the shoe.. v n

Similar letters oi' reference in each of the figures indicate like parts. t

A A represent the shoes, attached to the muller-arms` B B by bolts or screws pas-sing through the arms into projectionsor standards upon the back of the shoes, each having four' curvcd sides.

E is the inside point or lheel, and F the rear outside point ofthe shoe. G represents the point or toe of the shoe, showing the relative distance to the rim of the pun in its revolution.

His a groove, in a curved line on the face, running from the toe of the shoe at G back in a liuc, so as to strike a short distance back of tho heel or rear portion of the shoe at E.

Supplementary grooves I I, intersect with the groove H at-J J. The shoe isset at suoli an angle, with a.

` line drawn from the centre of motion to the' periphery of the pan, that the toe of the 'shoeat G will be carried about thirty degrees forward-of the same, as shown at O O, and sothat a., radial line will pass directly across the points of the shoe at E and F, shown in red at K K.

The advantage derived from shoes of this construction isK that the quicksilver, from its great density or' specic gravity, is carried by the motion of the pan outwards to the periphery, where it would remain were the ordinary shoe used, but with this shoe the quicksilver is caught on the point or toc of the shoe at G, and is carried back across the bottom of the pan, through the groove II, and strikes the heclvo'f the succeeding shoe at the point E, from whence it is thrown forward through the intersecting or supplementary groove I I, to the periphery ot' the pan, and so on through all of the shoes, thereby causing the quicksilver to covcr the bottom of the pan, and of course presenting a much greater surface to the pulp.

This shoe wears the bottom ofthe pan off level, whereas the ordinary shoe wears the bottom of' the pan off' in ridges., and'very uneven. Several days are required to bring it smoother even aga-in, so that good work can bedone by' the pan. v ii By the use of this shoe, the p'an can be charged with one-sixth more pulp, working it in the same time, thereby doing from fifteen to twenty per cent. more work than canibc performed with the same pan using the ordinary shoe, while from being set ahcad,`on an langle with a rightl line drawn from the centre to the rim of the pan, it requires a large percent-age less of power to do the same amount of work. l

Havingrthus described my invention, what I claim, and desire to secure by Letters Patent, is-

'lhe combination and arrangement, on the face of a. shoe or grinder for amalgamators, of the grooves H H, with the supplementary grooves I I, by which the quicksilver is taken from different points at the outer edge of said shoe, and Adelivered at different points at the rear of the same, to bc in the way of the following shoe, substantially as described.

In witness whereof'7 I have hereunto sct my hand and seal.

JOHNH. sULLooK. [L sj Witn esscs W. N. HALL, SAMUEL Evans. 

